Apparatus for feeding pulverized fuel.



V. Z. CARACRISTI. APPARATUS FOR FEEDING PULVERIZED FUEL. APPLICATIONFILED OCT. 4. 19l3- RENEWED JULY 29.1916.

l'atvntedSopt. 12, 1916.

wi/bnaooeoz f r 7 VIRGINHIS z. cnnacais'rr, or ALBANY, new oun APPATUSFOR FEEDING PULVEEIZED FUEL.

' Specification 0 Letters fatent. Patented @ept. 112, 1.91.6.

Application filed October 1, 1913, Serial No. 793,310. Renewed July 29,1916. Serial No. 112,132.

To all whom it may concern Be it known that 1, VIRGINIUS Z. CARA-CRISTI, a citizen of the United States of America, and-resident ofAlbany, in the county of Albany and'State of New York, have inventedcertain new and useful Improvements in Apparatus for Feeding PulverizedFuel, of which the following is a specification,

This invention relates to apparatus for feeding pulverized fuel, and theobject of the invention is to devise an apparatus for feeding pulverizedfuel being specially adapted for use with reference to steamboilers andfurnaces.

Another object of the invention is to provide a short but intense flame,and do away with any blow-pipe action, which isthe resultof mjecting thefuel and air at a high initial velocity.

The invention will be further described hereinafter and finally pointedout in the claims.

In the accompanying drawings, which show an embodiment of my invention,Figure 1 is a vertical longitudinal section through the apparatus, andFig. 2 is a partial end-elevation of the same.

Similar reference characters indicate corresponding partsin the views.

Referring to the drawings, the fuel-container 10 is providedwith aquantity of powdered fuel and has feeding devices 11 for the pulverizedfuel at the lower part thereof. These feeding devices consist ofvertically-arranged tubes, one next'to the other, and having their endsofdifferent elevations. Each of these'tubes is provided with a feedingorifice 14, and within the tubes are arranged helical or screw feedingdevices 13. These screws have at their upper ends gear-wheels 25 whichmesh with each other, so as to have one gear-wheel rotate the adjacentone. The end gear-wheel meshes with another gear-wheel 15 having a shaft16, which is driven by suitable drivin mechanism. Thus by the driving ofthe s aft 16 with its gear-wheel 15, all the gear-wheels 25 are rotated,and'thereby the helical feeding members 13 within the tubes 11 arerotated and cause the fuel within the container 10 to be fed by thescrews through the tubes 11 and out of the lower orifices 14 thereof.The air intended to be combined with this fuel to cause its combustionis forced in at-the portion 24, in the direction of the arrows 23,

vided and intimate combination of fuel and oxygen takes place, which isfed in this combined state into the furnace. Of course, instead of thescrews described, any other suitable conveying or feeding means can beprovided so as to bring about an intimate mixture. The air entering themember 24 may be by means of a draft caused by the combustlon or bysuitable mechanical means; the important feature, however, being thatthis air-current should not be of great velocity; the object of theinvention being to provide means by which fuel is fed into the mixingchamber in a finely-divided condition, by reason of which finely-dividedcondition the fuel can be'conveyed by a current of air of low velocityinto the part of the furnace in which combustion takes place, the fuelbeing there brought to the ignition point. The arrangement of theair-current inthe feeding orifices will cause the feeding orifices toremain cool and prevent them from being choked by the direct action ofthe heat. The box 27 may be widened toward the place where thecombustion takes place, so that the air-current, after being mixed withthe pulverized fuel, may be lowered in velocity and prevent a flame ofthe character of a blow-pipe. The air current will increase incross-section as it passes through the tapering box 27 so that eddies atright angles to its movement will be produced.

"I have shown one embodiment of my invention, but it is clear thatchanges may be made therein without departing from the spirit of theinvention asdefined in the appended claims.

What I desire to claim by Letters Patent is the following:

1. In a burner for pulverized fuel, a partially inclosed combustionspace for burning the fuel, a second partially inclosed space connectedtherewith, means in and throughout said second partially inclosed spacefor feeding a current of fuel into said second partially inclosed space,means for passing a space, and out therefrom into the com'bus-h acurrent of air into said second'inclosed 'said current and in adirection across the current,- until the mingled current of air and fuelpasses out of said second inclosedspace.

2. Ina-burner for pulverized fuel, a, par- I tially inclosed combustionspace for burnvsaid tubes, into the ing, the fuel, a second partiallyinclosed space connected therewith, means for feeding. the fuel into thesecond partially inclosed space in a plurality of streams, an

independent means for passing a current of air across said streams offuel consecutively, before said fuel enters the said combustion space,said air and fuel being intermingled before passing intosaid combustionspace.

3. In a burner for pulverizedfuel, a partially inclosedcombustion spacefor burning the fuel, a second partially inclosed space connectedtherewith, a plurality of feedtubes for feeding the fuel projecting intothe second' partially inclosed space, the portions of said feed-tubesprojecting into said second inclosed spacabeing of unequal length, andmeans- -fcr directing a current of air across-"the mouths of saidfeed-tubes, and beyond their orifices and into the inclosed combustionspace.

4. In a burner for pulverized fuel, a parconnected therewith, feed-tubesin and throughout" said second partially inclosed space for feeding thefuel into the second partially inclosedspace, the mouths of saidfeed-tubes being uniformly spaced from each other, and'means fordirecting a current of air from. the second partially inclosed space,and across the streams of fuel emerging from partially inclosedcombustion space e 5. In a burner for pulverized fuel, a par tiallyinclosed space of progressively increasing size, means for feeding fuelin separate currents to the partially inclosed space, along the lengthof it, means for in- Jecting a current of air-into the partiallyinclosed space at the smaller end of the saidv space for mixing the air'with the fuel as it is fed to said partially inclosed space in separatecurrents, anda partially inclosed combustion space at the larger end ofthe first named space, for receiving-the intermingled current of fueland air, the velocity of the said current of fuel and air being lessthan the velocity of the current of air at the entering end of the saidsecond partially inclosedspace.

6. In a' burner for pulverized fuel, a partially inclosed combustionspace for burning the fuel, a second partially inclosed space for mixingthe fuel with air from the atmosments at right angles to the maindirection of the flow of the air whereby said currents of (fuel and airare thoroughly interming e 7. In a burner for pulverized fuel, apartially inclosed combustionspace for burning the fuel, a secondpartially inclosed space for mixing the fuel with air taken I from theatmosphere,iand having a temperature below the ignition point, aplurality of means for feeding fuel into said second inclosedspace-,means for feeding a current of airacross said fuel, and means insaid inclosed space for splitting a portion of the current of air into aplurality of individual streams, and simultaneously imparting at thepoint of impingement of the portion of the'air current, moyementsangularly to the direction of flow.

8. In a fuel burner, a partiall inclosed combustion space for burning te fuel, a second partially inclosed, space for mixing the fuel withair,a series of spaced fuel feeding-tubes in and throughout said sec-. ondpartially inclosed space, and an air inlet passage for admitting airfrom the atmosphere at one end of said second partially inclosed space,said second partially inclosed space being enlarged away from said inletpassage toward an outlet assage to a partially inclosed space for urningthe fuel, whereby the velocity of the intermingled current of fuel andair entering said combustion space is less than the current of airentering from the atmosphere.

9. In a burner for ulverized fuel, a partially inclosed space or burningthe fuel, a second partially inclosed spaceconnected therewith, saidsecond partially inclosed 10. In a burner for pulverized fuel, apartially inclosed space having diverging walls,

a plurality of feed tubes arranged in a row aaa'aaea across the width'otthe saidinclosed space,

the orifices of said row of feed tubes extendroW and extending acrossthe width of the inclomd space, the second row of teed tubes havingtheir orifices a greater distance from the lowermost wall than the firstrow, and the third row having their orifices at a greater distance fromthe lowermost wall than the second row, and the fourth row having theirorifices at a greater distance than the third row, so that the innermostrow, at the-widest art of the inclosed space,- has the greatest stancefrom the'lowermost walhand an air feeding member at the narrowest ortionof the inclesed s ace.

ll. lna hurner for pulverized fue an air feeding" member, a mixingmember having top and bottom walls diverging from the air feedingmember, and a plurallty of rows of feed tubes arranged across the widthof the mixing member and along the length thereof; the first rowacrossthe width'extending lowermost, thatollowing rows across thev width beingeach shorter than the other, so that the last row across the width hasthe greatest distance from the lowermost wall of the mixing member, thefeed tubes forming the rows along the length of the mixing member beingin line with-each other.

'In testimony that l'claim the foregoing as my. invention, I have signedmy name in presence of two subscribing witnesms.

" 1 S a. caoms'rr.

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